Digital Optical Method (DOM) was developed during the first stage of this research to quantify plume opacity using digital photography. DOM was tested in the field during both daytime and nighttime conditions to evaluate its applicability. Results from those field tests demonstrated that DOM has the potential to serve as the alternative to the USEPA reference method, Method 9, because this new method is more objective and economical when compared to Method 9, and provides archival image for possible legal action.A manual-exposure controlled digital camera (Canon Powershot G3, located to
the west) and an automatic-exposure controlled digital camera (Sony DSC-S30,
located to the east) were used simultaneously to quantify the plumesa#39; opacitiesanbsp;...